Support for allowing gay and lesbian couples to marry has increased dramatically since the state legalized civil unions.

According to a Quinnipiac University Poll released Monday, Colorado voters support same-sex marriage by nearly a 2-1 margin.

Sixty-one percent of 1,298 registered Colorado voters surveyed support marriage equality, while 33 percent remain opposed.

Support among voters under 30 is nearly universal (81%).

But a majority (58%) of Republicans remain opposed.

Lawmakers last year approved a law which recognizes gay couples with civil unions. Marriage was not an option because of a 2006 voter-approved constitutional amendment which defines marriage in the state as a heterosexual union.

Comparing Monday's poll to a Public Policy Polling survey released in December of 2011, support for marriage equality has increased dramatically – from a plurality (47%) in 2011 to a large majority (61%) in 28 months.